JP4973715B2 - Printing device - Google Patents

Description

  The present invention relates to a printing apparatus having a duplex printing function. More specifically, the present invention relates to a printing apparatus having a sheet conveyance path (hereinafter referred to as “manual path”) for guiding a sheet manually inserted by a user to a printing unit.

  2. Description of the Related Art Conventionally, printing apparatuses that perform double-sided printing by automatically reversing paper using a re-conveying path that reverses the paper are known. There is also known a printing apparatus having a manual feed path for guiding a sheet manually inserted by a user to a printing unit. Furthermore, a printing apparatus having both a double-sided printing function and a manual feed path is disclosed in Patent Document 1, for example.

JP 2009-86506 A

  However, the conventional printing apparatus described above has the following problems. In other words, in a printing apparatus having both a double-sided printing function and a manual feed path, a countermeasure when a sheet is inserted into the manual feed path during the double-sided printing operation has not been sufficiently studied. For example, if the paper is uniformly stopped during the double-sided printing operation when the paper is inserted through the manual feed path, paper jam and paper overlap can be avoided, but the continuity of the printing operation is lacking.

  The present invention has been made to solve the problems of the conventional printing apparatus described above. That is, the problem is to provide a printing apparatus that efficiently performs processing when a sheet is inserted via a manual feed path during double-sided printing operation.

  In order to solve this problem, a printing apparatus has a double-sided conveyance path for conveying paper when performing double-sided printing, and merges with the double-sided conveyance path, and manually inserted paper at the junction with the double-sided conveyance path. A manual feed path that transports the paper, a detection unit that detects that paper has been inserted into the manual feed path, and that duplex printing can continue even if paper is inserted into the manual feed path during duplex printing. Within the continuation period, the determination unit determines whether or not the detection unit has detected the paper, and if the determination unit makes an affirmative determination, the double-sided printing operation is performed on the paper being conveyed to the double-sided conveyance path. A control unit is provided that stops the double-sided printing operation on the paper conveyed to the double-sided conveyance path when the negative determination is continued.

  The printing apparatus of the present invention includes a duplex conveyance path and a manual feed path, and a period during which it is determined that the duplex printing operation can be continued even if a sheet is inserted into the manual feed path during the duplex printing operation (continuation period). Is predetermined. The period in which the duplex printing operation can be continued corresponds to, for example, a period in which a sheet printed on both sides does not collide with a sheet inserted from the manual feed path. Then, it is determined whether or not the timing at which the sheet is inserted into the manual feed path is within the continuation period. If it is within the continuation period, the duplex printing operation is continued, and if it is outside the continuation period, the duplex printing operation is stopped.

  That is, the printing apparatus of the present invention stops the double-sided printing operation and avoids paper jam and paper overlap when paper is inserted into the manual feed path outside the continuation period. On the other hand, if it is within the continuation period, at least double-sided printing is completed for the paper in the middle of double-sided printing operation. That is, even if a sheet is inserted into the manual feed path, printing is continued within a certain period, and it can be expected that the printing process is completed efficiently.

  As a specific example of the above-mentioned continuation period, for example, after the paper transported to the double-sided transport path is transported to the re-transport path that reverses the paper in the double-sided transport path, the paper is more paper than the junction. This corresponds to a period until it passes through a position determined in accordance with the paper size on the upstream side in the transport direction. The continuation period is a period in which a period during which the double-sided printing operation is predicted to be continued is determined in advance, and does not determine whether or not it is actually possible. For example, the actual continuation period varies depending on the length of the sheet inserted in the manual feed path (which cannot be specified when the sheet is detected). In other words, the continuation period defines the forecast period that can be continued, and the length of the period depends on how much risk of not being able to continue is allowed. Therefore, the determination unit predicts and determines whether or not the double-sided printing operation can be continued at the time when the sheet is detected.

  In addition, the control unit of the printing apparatus according to the present invention, when the determination unit makes an affirmative determination, an image corresponding to a sheet following the sheet conveyed to the double-sided conveyance path with respect to the sheet inserted into the manual feed path. Should be printed. Since the control is continued, the entire printing process can be completed at an early stage by printing on the paper inserted from the manual feed path.

  The control unit of the printing apparatus performs printing on the paper when the printing on the paper inserted in the manual feed path can be completed, and does not print the paper when the printing cannot be completed. The paper should be discharged without reversing. Here, “when printing on a sheet inserted in the manual feed path can be completed” corresponds to, for example, a case where the printing corresponding to the sheet following the sheet conveyed to the duplex conveyance path is single-sided printing. As a result, a higher level of response is achieved and the user's effort is reduced.

  In addition, when the determination unit makes an affirmative determination, the control unit of the printing apparatus according to the present invention preferably does not print on the paper inserted into the manual feed path, and discharges the paper without inverting it. In this case, since the sheet is discharged promptly, there is a low possibility of causing a conveyance failure. Further, since the paper is discharged without printing on the paper, the paper can be reused.

  According to the present invention, a printing apparatus that efficiently performs processing when a sheet is inserted through a manual feed path during a double-sided printing operation is realized.

1 is a perspective view illustrating a schematic configuration of a printer according to an embodiment. FIG. 2 is a conceptual diagram illustrating an internal configuration of an image forming unit of the printer illustrated in FIG. 1. FIG. 3 is a conceptual diagram illustrating a configuration near a registration roller inside an image forming unit. FIG. 2 is a block diagram illustrating an electrical configuration of a printer. It is a flowchart which shows the procedure of the double-sided printing conveyance process concerning a 1st form. It is a time chart which shows the relationship between a duplex printing operation and a continuation period. It is a flowchart which shows the procedure of the double-sided printing conveyance process concerning a 2nd form.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of a printing apparatus according to the invention will be described in detail with reference to the accompanying drawings. In this embodiment, the present invention is applied to an electrophotographic color printer having a double-sided printing function.

[Entire printer configuration]
As shown in FIG. 1, the printer 100 according to the embodiment includes an image forming unit 10 that forms an image on a sheet and an image reading unit 20 that reads an image of a document. Further, on the front side of the image reading unit 20, an operation panel 40 including a display unit 41 formed of a liquid crystal display and a button group 42 including a start key, a stop key, a numeric keypad, and the like is provided. 40 enables operation status display and user input operation.

  Further, at the bottom of the image forming unit 10, a paper feed cassette 91 that can be attached to and detached from the apparatus main body and accommodates paper is provided. Further, a manual feed port 93 for manually inserting a sheet by a user is provided on the side surface side of the image forming unit 10.

[Configuration of image forming unit]
As shown in FIG. 2, the image forming unit 10 forms a toner image, transfers the toner image to a sheet, a fixing unit 8 that fixes unfixed toner on the sheet, and before image formation. A paper feed cassette 91 for placing the paper and a paper discharge tray 92 for placing the paper after image formation. In the image forming unit 10, paper stored in a paper feed cassette 91 positioned at the bottom passes through the paper feed roller 71, the registration roller 72, the process unit 50, and the fixing device 8, and passes through the paper discharge roller 76. A substantially S-shaped transport path 11 (a chain line in FIG. 2) is provided so as to be guided to the upper discharge tray 92.

  The process unit 50 can form a color image, and process units corresponding to the respective colors of yellow (Y), magenta (M), cyan (C), and black (K) are arranged in parallel. Specifically, a process unit 50Y that forms a Y-color image, a process unit 50M that forms an M-color image, a process unit 50C that forms a C-color image, and a process unit that forms a K-color image 50K. Further, the process unit 50 is stretched by an exposure device 53 that irradiates light to each of the process units 50Y, 50M, 50C, and 50K and rollers 73 and 74, and the sheet is transferred to each of the process units 50Y, 50M, 50C, and 50K. And a conveyor belt 7 for conveying the position. Each of the process units 50K, 50Y, 50M, and 50C forms a toner image by a known electrophotographic method.

  The image forming unit 10 takes out the sheets placed in the sheet feeding cassette 91 one by one, conveys the sheets to the process unit 50, and transfers the toner image formed in the process unit 50 onto the sheet. Further, the sheet on which the toner image is transferred is conveyed to the fixing device 8 and the toner image is thermally fixed on the sheet. Then, the sheet after fixing is discharged to a paper discharge tray 92.

  The image forming unit 10 is provided with a duplex printing mechanism for printing on both sides of the paper. The conveyance path 12 in FIG. 2 (the two-dot chain line in FIG. 2) allows the paper to be printed on the back surface (the other surface) of the paper that has been printed on one surface (one surface). This is a transport path for reversing and transporting again to the process unit 50. The conveyance path 12 branches from the conveyance path 11 at a position downstream of the fixing device 8 in the sheet conveyance direction. Further, the conveyance path 12 includes a conveyance path 121 (hereinafter referred to as “temporary stop path 121”) for temporarily waiting the sheet to reverse the sheet conveyance direction, and a conveyance for returning the reversed sheet to the conveyance path 11. And a path 122 (hereinafter referred to as “return path 122”).

  Specifically, in double-sided printing by the double-sided printing mechanism, the paper is reversed by the following procedure. First, printing is performed on one side via a conveyance path 11 (hereinafter, referred to as “forward feeding path 11”), and the printed paper on one side is transferred to the conveyance path 12 (hereinafter, “ Into the re-conveying path 12). Then, the sheet is once carried into the stop path 121 and the conveyance is temporarily stopped. Thereafter, the direction of rotation of the turning roller 75 is switched to reverse the paper transport direction, and the paper is carried into the return path 122. Then, the sheet is returned to the regular feeding path 11 on the upstream side of the process unit 50 of the regular feeding path 11. As a result, the front and back sides of the sheet are reversed and printing is performed on the other side. That is, in the image forming unit 10, the double-sided conveyance path is configured by the normal feeding path 11 and the re-conveyance path 12.

  The image forming unit 10 is provided with a manual paper feed mechanism for the user to manually insert paper. A conveyance path 13 in FIG. 2 (broken line in FIG. 2, an example of a manual feed path) is a path for guiding the paper inserted from the manual feed port 93 provided on the side surface of the main body to the junction with the normal feed path 11. It is. The conveyance path 13 (hereinafter referred to as “manual feeding path 13”) has a manual feed port 93 as an upstream end and a junction with the normal feeding path 11 as a downstream end. This joining point is located upstream of the registration roller 72 in the normal feed path 11.

  Specifically, in printing by the manual paper feed mechanism, the paper is transported in the following procedure. First, a sheet is inserted from the manual feed port 93. The inserted sheet is carried into the normal feeding path 11 via the manual feed path 13 and when the sheet is inserted up to the registration roller 72, the registration roller 72 grips the sheet, and the sheet is transferred to the image forming unit. 10 in. Thereafter, printing is performed by the sheet passing through the process unit 50. Note that the user continues to insert the paper until the registration roller 72 grips the paper, and automatic conveyance is performed after the registration roller 72 grips the paper.

  In the image forming unit 10, various sensors for detecting the passage of paper are arranged. Specifically, as shown in FIG. 2, a paper feed sensor 61 is disposed at a position immediately downstream of the paper feed roller 71 in the transport direction of the normal feed path 11. The paper feed sensor 61 is used to detect the carry-in of paper from the paper feed cassette 91 and to obtain the paper length of the paper.

  As shown in FIG. 3, a pre-registration sensor 62 is disposed at a position immediately upstream of the registration roller 72 in the conveyance direction of the normal feed path 11. The pre-registration sensor 62 (an example of a detection unit) is located on the downstream side of the junction 14 between the normal feed path 11 and the manual feed path 13, and also serves to detect the insertion of paper from the manual feed path 13. In addition, a post-registration sensor 63 is disposed at a position immediately downstream of the registration roller 72 in the conveyance direction of the normal feed path 11.

  In addition, as shown in FIG. 2, in the conveyance direction of the reconveying path 12, downstream of the turning roller 75 and upstream of the rejoining point between the reconveying path 12 and the normal feeding path 11. A re-transport sensor 64 is arranged. In addition, a paper discharge sensor 65 is disposed at a position immediately upstream of the paper discharge roller 76 in the conveyance direction of the normal feed path 11. The sensors arranged in the image forming unit 10 are not limited to these.

[Electrical configuration of printer]
Next, the electrical configuration of the printer 100 will be described. As shown in FIG. 4, the printer 100 includes a CPU 31, a ROM 32, a RAM 33, an NVRAM (nonvolatile RAM) 34, an ASIC 35, and a network interface 36. The ASIC 35 is electrically connected to the image forming unit 10, the image reading unit 20, the operation panel 40, and the like.

  The ROM 32 stores various control programs for controlling the printer 100, various settings, initial values, and the like. The RAM 33 is used as a work area from which various control programs are read or as a storage area for temporarily storing image data.

  The CPU 31 stores each processing result in the RAM 33 or NVRAM 34 in accordance with a control program read from the ROM 32 and signals sent from various sensors, while the components of the printer 100 (for example, the lighting timing of the exposure device 53, the normal feed path 11). In addition, a driving motor (not shown) for various rollers constituting the re-conveying path 12 and a moving motor (not shown) for the image sensor unit constituting the image reading unit 20 are controlled via the ASIC 35.

  The network interface 36 is connected to a network such as the Internet, and enables connection to an external device in which a printer driver for the printer 100 is incorporated. The printer 100 can exchange print jobs via the network interface 36.

[Double-sided printing transport processing]
[First embodiment]
Next, duplex printing conveyance processing (an example of a detection unit, a determination unit, and a control unit) of the printer 100 will be described with reference to the flowchart of FIG. For example, the printer 100 executes double-sided printing conveyance processing when a double-sided printing job sent from an external device is received or when double-sided printing is instructed by the operation panel 40 To do. In the following description, the operation when a sheet is inserted from the manual feed port 93 during the duplex printing operation will be mainly described, and the description of the printing operation will be omitted.

  First, paper feeding from the paper feeding cassette 91 is started (S101). It can be determined by a signal from the paper feed sensor 61 that the paper has been carried into the normal feed path 11. In the following description, a sheet fed from the sheet cassette 91 for duplex printing in S101 is referred to as “double-sided sheet”, and a sheet inserted from the manual feed path 13 is referred to as “manual sheet”.

  Next, based on the signal from the paper feed sensor 61, the paper size of the double-sided paper carried into the normal feed path 11 is acquired (S102). For example, based on the signal from the paper feed sensor 61, the time required from passing the leading edge to the trailing edge of the double-sided paper is obtained, and the paper length in the paper conveyance direction is determined based on the time and the paper conveyance speed. calculate.

  Next, it is determined whether or not a sheet has been inserted from the manual feed path 13 from the start of the feeding of the double-sided paper to the start of the reversing operation of the double-sided paper (S103). The start of the reverse operation of the double-sided paper can be determined by the fact that the trailing edge of the double-sided paper is conveyed to the re-conveying path 12. The conveyance of the double-sided paper to the re-conveyance path 12 can be determined by, for example, the elapsed time from the detection of the trailing edge of the double-sided paper by the post-registration sensor 63. The double-sided paper conveyed to the re-conveying path 12 is in a state where printing has been performed on one side by passing through the process unit 50. The paper insertion from the manual feed path 13 can be determined by detecting the paper at an unexpected timing by the pre-registration sensor 62, for example. That is, the detection of the double-sided paper can be expected by the elapsed time from the detection timing of the paper feed sensor 61 or the detection timing of the re-transport sensor 64, but the detection timing of the paper inserted from the manual feed path 13 cannot be expected.

  Until the double-sided paper starts the reversal operation, it can be considered that the double-sided paper is moving in the normal feeding path 11. Therefore, there is a possibility that both the double-sided paper and the manual paper will collide when the manual paper is detected (S103: YES) until the double-sided paper starts the reversing operation (S104: NO). Is expensive. Therefore, the conveyance of both sheets is stopped and an error message is displayed on the display unit 41 of the operation panel 40 (S191). Thereafter, this process ends abnormally.

Next, after the manual feed paper is not inserted and the double-sided paper starts the reversing operation (S104: YES), the top of the double-sided paper is a predetermined value determined for each paper size in the re-conveying path 12. It is determined whether or not a sheet has been inserted from the manual feed path 13 until it passes the position (S105). This predetermined position is a limit position that allows manual sheet insertion, and the position differs depending on the sheet size. Therefore, in the printer 100, a limit position is determined in advance for each paper size, and a predetermined position is determined according to the paper size acquired in S102. The arrival of the leading edge of the double-sided paper at a predetermined position can be determined, for example, by the elapsed time from the detection of the leading edge of the double-sided paper by the re-transport sensor 64. In this case, the position of the re-transport sensor 64 is upstream of the predetermined position.

  The double-sided paper is moving in the re-conveying path 12 from when the double-sided paper starts the reversing operation until it reaches a predetermined position. Therefore, if manual paper is detected during the period from when the double-sided paper starts reversing until it reaches the specified position, there is a possibility that the conveyance of the manual paper will affect the conveyance of the double-sided paper. Low.

  Therefore, if the manual paper is detected (S105: NO) during the period from when the double-sided paper starts the reversal operation until it reaches the predetermined position (S106: NO), the manual paper is removed from the process section. It carries in toward 50 (S121). The carry-in of the manual sheet is an unusual conveyance during the double-sided printing operation, and printing is not performed on the manual sheet. As a result, the manual sheet in the blank state is discharged (S122).

  The double-sided printing operation is also continued, the double-sided paper is returned to the normal feeding path 11, and the double-sided paper is carried into the process unit 50 (S123). Then, printing is performed on the other side of the double-sided paper. Thereafter, the double-sided printed paper is discharged (S124).

  On the other hand, when there is no manual sheet insertion and the double-sided paper reaches a predetermined position (S106: YES), the manual-feed path is used until the double-sided paper is discharged again via the process unit 50. From step 13, it is determined whether or not a sheet has been inserted (S107). Completion of the discharge of the double-sided paper can be determined, for example, by the elapsed time from the detection of the trailing edge of the double-sided paper by the paper discharge sensor 65.

  It can be considered that the double-sided paper is moving in the normal feeding path 11 again after the double-sided paper reaches a predetermined position until it is discharged. For this reason, if a manual sheet is detected after the double-sided paper reaches a predetermined position until it is discharged (S108: NO), the double-sided paper and the manual-sheet are detected. There is a high probability that both sheets will collide. Therefore, the conveyance of both sheets is stopped and an error message is displayed on the display unit 41 of the operation panel 40 (S191). Thereafter, this process ends abnormally.

  It is determined whether or not there is an unprinted page after the completion of discharging the double-sided paper (S108: YES) or after S124 (S109). If there is an unprinted page (S109: YES), the process returns to S101 to start feeding a new double-sided sheet. On the other hand, if there is no unprinted page (S109: NO), this process is terminated normally.

  FIG. 6 is a time chart showing the progress from when the double-sided paper is fed to when it is ejected. In the double-sided printing conveyance process according to the first embodiment, the time between the time when the double-sided paper is carried into the re-conveyance path 12 and the time when it reaches a predetermined position in the re-conveyance path 12 (continuation period in FIG. 6) is a manual error. Paper insertion is allowed. For this reason, the manual paper inserted during this continuation period is taken into the apparatus and discharged via the process unit 50. That is, in the double-sided printing conveyance process of the first embodiment, the double-sided printing operation is continued when a manual sheet is inserted during the continuation period. In this case, the continuity of the duplex printing operation can be maintained.

[Second form]
Next, another form of duplex printing conveyance processing (an example of a detection unit, a determination unit, and a control unit) of the printer 100 will be described with reference to the flowchart of FIG. In the second embodiment, even if a manual sheet is inserted during the double-sided printing operation, printing is performed on the manual sheet when a predetermined condition is satisfied. This is different from the first mode in which a manual sheet is always discharged as a blank sheet.

  In this embodiment, when a manual sheet is inserted between the time when the double-sided sheet starts the reversing operation and the time when the sheet reaches a predetermined position in the re-conveyance path 12 (continuation period) (S105: YES). This is an application example. Therefore, FIG. 7 is a modification of the part from A to B in FIG. In addition, about the process same as a 1st form, the same step number as a 1st form is attached | subjected and description is abbreviate | omitted.

  First, preparation for printing of a page (referred to as “next page”) following a page (referred to as “current page”) scheduled to be printed on the other side of the double-sided paper currently moving on the re-conveyance path 12 is completed. In step S120, it is determined whether the next page is non-double-sided printing (that is, printing on only one side). Note that the next page here may be a page that is printed on the paper that is fed after the double-sided printing on the double-sided paper being transported is completed. For example, the last page may be used. Completion of the print preparation can be determined, for example, based on whether or not the expansion of the print data of the print target page has been completed.

  That is, in S120, it is determined whether or not printing of the next page can be started at the time when the manual sheet is detected (S105: YES). Further, it is determined whether or not the next page is single-sided printing in which printing is performed only on one side.

  When the preparation for printing the next page is completed and the next page is single-sided printing (S120: YES), the manual paper is carried toward the process unit 50 (S141). At this time, since the next page can be printed, the next page is printed on the manually fed paper. Thereafter, the single-side printed manual sheet is discharged (S142).

  Thereafter, the double-sided paper is returned to the normal feed path 11, and the double-sided paper is carried into the process unit 50 (S143). Then, the current page is printed on the other side of the double-sided paper. Thereafter, the double-sided printed paper is discharged (S144).

  On the other hand, if the next page is not ready for printing, or if the next page is duplex printing (S120: NO), the manual feed sheet is ejected as a blank sheet (S121, S122) as in the first embodiment. ), The current page is printed on the other side of the double-sided paper, and the double-sided paper is discharged (S123, S124).

  That is, in the double-sided printing conveyance process of the second embodiment, if the next page is ready for printing and the next page is not double-sided printing, it is determined that printing on the manual sheet can be completed, and The next page is printed. Accordingly, the conveyance of the manual sheet is not wasted, and the printed matter of the next page can be acquired at an early stage, so that the processing time of the entire print job can be shortened.

  As described above in detail, the printer 100 according to the present embodiment performs the double-sided printing operation during the period from the start of the reverse conveyance of the double-sided paper to the time when the double-sided paper passes the predetermined position on the re-conveyance path 12. The continuation period. Even if a manual sheet is inserted during the double-sided printing operation, the double-sided printing operation is continued if the manual paper is inserted within the continuation period. Has stopped. That is, if the manual paper insertion timing is outside the continuation period (S103: YES or S107: YES), the printer 100 stops the double-sided printing operation and avoids paper jam and paper overlap. On the other hand, if it is within the continuation period (S105: YES), the manual paper is taken in and discharged, and double-sided printing is completed for the double-sided paper in the middle of the double-sided printing operation. That is, the printer 100 can continue printing even if paper is inserted into the manual feed path 13 within a certain period, and it can be expected that the printing process is completed efficiently.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, the present invention is not limited to a printer, and can be applied to any apparatus having a double-sided printing function such as a multifunction machine or a FAX apparatus. Further, the image forming method of the image forming unit is not limited to the electrophotographic method, and may be an ink jet method. Further, even if a color image can be formed, it may be dedicated to a monochrome image.

  In the embodiment, no conveying means (such as a conveying roller) exists in the manual feed path 13, but a conveying means may be arranged. That is, a conveying means for assisting insertion of the manual sheet may be disposed in the manual feed path 13.

  In the embodiment, the continuation period is from the start of the reversal operation of the double-sided paper until it reaches a predetermined position in the re-conveyance path 12, but the continuation period is not limited to this. In other words, it may be a period during which it is expected that double-sided printing can be continued, and the period may be appropriately determined according to the allowable amount of possibility of a conveyance failure and the arrangement of the re-conveyance path. For example, the predetermined position in the re-conveyance path 12 may not be variable depending on the paper size but may be a fixed position. In addition, when the joining location of the re-conveying path 12 and the joining location of the manual feeding path 13 are separated from each other, a predetermined position may be provided in the normal feeding path 11.

DESCRIPTION OF SYMBOLS 10 Image formation part 11 Normal feed path 12 Reverse transfer path 13 Manual feed path 14 Merged part 20 of normal feed path and manual feed path 20 Image reading part 50 Process part 100 Printer

Claims (6)

A duplex transport path for transporting paper when performing duplex printing;
A manual feed path that merges with the double-sided conveyance path and conveys a manually inserted sheet toward a merged point with the double-sided conveyance path;
Taking in the paper that is located downstream of the merged portion in the paper conveyance direction on the double-sided conveyance path and is conveyed from the manual feed path beyond the merged point by the user, and takes the paper into the double-sided conveyance path Part,
A detection unit that detects that the paper is inserted into the manual feed path before the take-in unit grips the paper inserted from the manual feed path ;
Definitive during duplex printing operation, in continuing period in which the sheet inserted from the sheet and manual feed path to be double-sided printed defined as the period that does not conflict, a determination unit that the sensing unit to determine whether the detected paper ,
When the determination unit makes an affirmative determination, the double-sided printing operation is continued on the paper conveyed to the double-sided conveyance path, and when the negative determination is made, the sheet is conveyed to the double-sided conveyance path. A control unit for stopping the duplex printing operation;
A printing apparatus comprising: The printing apparatus according to claim 1,
When the determination unit makes an affirmative determination, the control unit prints an image corresponding to a sheet following the sheet conveyed to the double-sided conveyance path on the sheet inserted into the manual feed path. A printing apparatus characterized by that. The printing apparatus according to claim 2,
The control unit performs printing on the paper when the printing on the paper inserted into the manual feed path can be completed, and does not print the paper without inverting the paper when the printing cannot be completed. A printing apparatus for discharging paper. The printing apparatus according to claim 3,
The case where the printing on the paper inserted in the manual feed path can be completed is a case where the printing corresponding to the paper subsequent to the paper conveyed on the double-sided conveyance path is single-sided printing. The printing apparatus according to claim 1,
When the determination unit makes an affirmative determination, the control unit does not perform printing on the paper inserted into the manual feed path, and discharges the paper without inverting it. In the printing apparatus as described in any one of Claims 1-5,
The continuation period is the time when the paper transported to the double-sided transport path is transported to the re-transport path that reverses the paper in the double-sided transport path, and then the paper is moved in the paper transport direction from the merging point. A printing apparatus, characterized in that it is a period until it passes through a position determined on the upstream side according to the paper size.

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